⚡ Bolt: Optimize binary precedence lookup

[ericbfriday]

💡 What: Replaced the manual length-based dispatch for operator precedence with a direct string switch statement.
🎯 Why: In modern V8 engines, direct string switches for known static strings are highly optimized, outperforming complex manual dispatch based on length and character codes.
📊 Impact: Microbenchmarks show a ~4x speedup (from ~1315ms to ~305ms for 10M iterations) for precedence lookups, contributing to faster parsing overall.
🔬 Measurement: Run npm run test to ensure all tests pass. Performance was measured via a targeted microbenchmark.

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PR created automatically by Jules for task 15839449243155272043 started by @ericbfriday

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